Belt-trimming machine.



E. F. THORBN.

BELT TRIMMING MACHINE.

APPLICATION FILED JAN. 15, 1912.

1,125,602. Patented Jan. 19, 1915.

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THE NuRRls PETERS 60.. F'HOTCMJTHO WASHINGIOHL D c E. P. THUREN.

BELT TRIMMING MACHINE.

APPLIGATION FILED JAN.15, 1912.

1,125,692, Patented Jan.19,1915.

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ERNST FRIDOLF THOREN, OF ST. LOUIS, MISSOURI, ASSIGNOR F ONE-HALF TD EMIL E. LATIN, 0F CLAYIION, MISSOURI.

BELT-TRIMMING MACHINE.

Application Med January 15, 1912.

To all 1.071 am it may concern Be it known that I, ERNST FnIDoLr THO- BEN, a subject of the King of Sweden, residing in the city of St. Louis and State of Missouri, have invented a certain new and useful Improvement in Belt-Trimming Machines, of which the following is a specification.

This invention relates to machines for trimming the edges of belts, and has for its primary object to provide an improved construction, combination and arrangement of parts in a device of this character which can be simply, economically and durably constructed, and which will be rapid and efficient in its action.

One of the objects of the present invention is to provide improved adjustments whereby the machine can be quickly adapted to perform its work upon belts of different sizes and thicknesses.

Toward the attainment of this object, my invention contemplates the provision of an arbor adapted to receive cutters of various sizes, and an improved work support which is adjustable axially of said arbor and transversely thereto.

Another object is to provide an improved cutter for a machine of this character, and

improved means for holding the strap or belt in operative relation to said cutter.

A. further object is to provide an improved adjustable guide for retaining the belt in proper relation to the cutter during its passage through the machine.

Other and further objects will appear in the spec1fication,and be specifically pointed out in the appended claims, reference being had to the accompanying drawings exemplifying the invention, and in which,

Figure 1 is a side elevation of a machine constructed in accordance with the principles of the present invention. Fig. 2 is an end elevation of the same, parts being broken away. Fig. 3 is a section on the line IIIIII, Fig. 2. Fig. 4 is a section on the line IV-IV, Fig. 3.1 Fig. 5 is a top plan view of the machine. Fig. 6 is a fragmentary detail section on an enlarged scale on the line VIVI, Fig. 5. Fig. 7 is a fragmentary section on an enlarged scale of the cutter disconnected, showing its operative.

Specification of Letters Patent.

base plate 1, and is provided Patented J an. 19, 1915.

Serial No. 671,253.

the base plate 1 of a. bearing standard 2 may be mounted upon a table 8, or any other suitable support. Said standard is provided with a pair of tandem bearing boxes 4, within which is journaled an arbor 5 which can be conveniently driven by means of a pulley 6 on the rear end of said arbor.

As shown best in Figs. 3 and 4, the forward end of the arbor is provided with an eXpansible sleeve 7 by means of which cutters of various sizes can be locked to the arbor 5 bymeans of a washer 8, which is clamped in position by a screw 9. The cutter 10 is, in the present embodiment, provided with a peripheral groove 11, which is substantially V-shaped, with the bottom of the groove rounded to trim and form the lateral edges of the belt 12 (indicated in dotted lines in Fig. 4) as it is drawn through the machine. By providing a rotary cutter with a groove of this shape, all danger of marring the flat surfaces of the belt or strap are obviated. Moreover, the shape of the groove adapts the belt or strap to be resiliently pressed downinto the groove during a very rapid rotation of the cutter, which imparts a smooth hard finish to the edges.

In order to provide simple and efficient means for guiding the belt through the machine, I provide an elongated table 13, which is provided with a longitudinal slot 14, through which the belt is drawn endwise, an adjustable guide 15 being disposed within the groove 14 for supporting the broad sides of the belt as it is drawn over the cutter'10. A pairof adjustment screws 16 are provided. adjacent their ends. with grooves 17 into which pins 18 (see Fig. 6) project to permit said screws to be turned in ad justing the position of the guide 15. Lock nuts 19 are provided for retaining the screws 16 in ad usted position. In order to hold the beltagainst edgewise displacement a presser plate 20 is slidably mounted upon a pair of spaced screws 21, said plate being suspended at opposite ends between oppositely arranged springs 22, the tension in which is regulated by thumb nuts 23. thus adapting the desired pressure to be obtained for various widths of belts, and such pressure to be adjusted at will.

In the embodiment shown in the drawings, a horizontal platen 24 is bolted to the with lateral flanges 25 which form a dovetailed guide for the slide 26, which is adjustable axially to the arbor 5 for locating the table 13 with respect to the cutter 10. For this purpose, the slide 26 is provided with a slot 27 through which projects the clamping .bolt 28. In order to provide a vertical adjustment of the table 13, said table is provided with an apron 29 which is slidably mounted on the upright plate 20, whichis integrally formed with the slide 26. The apron 29 is provided with a pair of slots 31 for the reception of the clamping screws32. A sheet metal housing 33 is preferably mounted around the cutter and provided with a downward discharge 3st which may conmunicate with any suitable take-off or receptacle (not shown on the drawings). A closure 35, which is hinged at 36, permits access to the cutter, andvertical' adjustment for the table. The closure 35 is provided with a clip 37 which retains it in closed position The operation of my improved belt trimming machine will now be readily understood, and briefly stated, is as follows: The guide 15 is first adjusted to permit the easy passage of the belt to be trimmed without lateral play of the same. The pressure plate 20 is next adjusted to maintain the desired resilient pressure for the most efficient ac tion of the machine, it being usual to complete a single edge of a great many belts before the machine is set for the other edge. This being done, the table 13 is adjusted vertically to bring the bottom of the groove 11 in the cutter 10'the desired distance above the bottom of theslot 14: in the table 13. In the event of the cutter 10 being changed for a broader or narrower cutter, the slide 26 will be first adjusted to bring the edge of the groove 11 in the cutter 10 intoalinement with the fixed wall of the slot 14, as shown in Fig. 3. The desired number of belts may then be drawn through the machine, and inasmuch as the arbor 5 can be very rapidly rotated, the output is greatly increased over what has heretofore been possible in belt trimming machines.

What I claim is:

1. In a belt trimming machine, a, table having a flat surface, an opening formed in the surface of said table, a cutter located in.

said opening, said cutter adapted to project above the surface of said table, and a presser plate located in a plane above said cutter, said presser plate adapted to engage one edge of a leather strip while said cutter is engaging the opposite edge of said leather strip.

2. In a belt trimming machine, an elongated table provided with a longitudinal slot, arotary cutter located below and projecting above the, bottom wall of] said slot, and means forhol'd'ing' one edge of'a leather strip against said cutter as it is drawn through said slot, said means comprising a presser plate which is adapted to bear against one edge of said leather strip.

3. In a belt trimming machine, the combination with a table provided with a slot and an opening in the bottom wall of said slot, of a rotary cutter located below said slot with its peripheral edge projecting through said opening above the bottom of said slot, and means for permitting adjustment of said table with reference to said cutter.

l. In a belt trimming machine, the combination with a rotary arbor of a cutter mounted on said arbor, a table extending transversely of said arbor, said table being provided with a work guiding slot, an opening formed in the bottom wall of said slot and. an adjustable guide plate extending longitudinally of said slot, the periphery of said cutter adapted to project through said opening.

5. Ina belt trimming machine, the combination with an arbor, of a peripherally grooved cutter mounted thereon, a work table provided with a longitudinal slot, means for permitting adjustment of said table laterally to aline said slot with the groove in the cutter, an adjustable guide mounted in said slot for slidably retaining a belt in registration with said groove, and a presser resiliently mounted above and across said slot to retain the belt against edgewise displacement.

presser resiliently mounted above and across.

said slot to retain the belt against edgewise displacement, and a housing inclosing said cutter, said housing being provided with a discharge outlet leading from said cutter.

7. In abelt trimming machine, the combination with a standard provided with a base plate and a tandem bearing, of an arbor journaled insaid bearing, said arbor being provided on one end with a pulley and on its other end with a cutter, a horizontal guide secured to said base plate, a slide reciprocable in said guide, and a work supporting table provided with a depending apron adjustable vertically on said slide.

'8. In a belt trimming machine, the combination with a table provided with a slot and an opening in the bottom wall of said slot, of a rotary cutter located below said slot with its peripheral edge projecting through said; opening above the bottom of said slot, means "for' permitting' adjus ment of said table with reference to said cutter, and slidable means for holding a leather strip against said cutter as it is drawn through said slot.

9. In a belt trimming machine, a table therefor provided with a slot, a rotary cutter located below and projecting above the bottom of said slot, a peripheral groove formed in said cutter, and adjustable means for pressing the edge of a strip into the groove of said cutter.

10. In a belt trimming machine, a table provided with a slot, a cutter located below and projecting above the bottom of said slot, and a presser plate in a plane above said cutter, said presser plate adapted to engage one edge of a leather strip while said cutter is engagingthe opposite edge of said leather strip.

11. In a belt trimming machine, a table provided with a slot, a cutter located below and projecting above the bottom of said slot,

a presser plate in a plane above said cutter, said presser plate adapted to engage one edge of a leather strip while said cutter is engaging the opposite edge of said leather strip, and an adjustable guide mounted in said slot for slidably retaining said leather strip in registration with said cutter.

ERNST FRIDOLF THOREN.

In the presence of- E. LAUN, N. C. HAMMON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

